21232031320 has 16 divisors (see below), whose sum is σ = 47772070560. Its totient is φ = 8492812512.

The previous prime is 21232031299. The next prime is 21232031321. The reversal of 21232031320 is 2313023212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232031321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265400352 + ... + 265400431.

It is an arithmetic number, because the mean of its divisors is an integer number (2985754410).

Almost surely, 2^21232031320 is an apocalyptic number.

21232031320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232031320 is an abundant number, since it is smaller than the sum of its proper divisors (26540039240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232031320 is a wasteful number, since it uses less digits than its factorization.

21232031320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530800794 (or 530800790 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21232031320 its reverse (2313023212), we get a palindrome (23545054532).

The spelling of 21232031320 in words is "twenty-one billion, two hundred thirty-two million, thirty-one thousand, three hundred twenty".